Speed-time graphs show speed on the vertical ... A negative gradient shows the rate of 'slowing down' or deceleration. Velocity-time graphs show velocity on the vertical axis.

Surprisingly, not all textbooks agree on the definition of speed ... the definition of average velocity. When the object goes from position 1 to 2, it will take some time. I will call this ...

Velocity-time graphs show velocity on the vertical axis. Acceleration is still represented by the gradient. Key fact The gradient of speed-time and velocity-time graphs represent acceleration.